It seems the Permatex Right Stuff Red 90 minute is best if your concerns are temp related (titanium exhaust)...
E6000 is rated to withstand intermittent temperatures from -40°F to 180°F (-40°C to 82°C) once fully cured. This temperature range is suitable for many projects, but it's important to note that high temperatures, such as those encountered in an oven or direct summer sun for extended periods, can cause the adhesive to soften and fail.
Permatex Right Stuff is highly heat resistant, with the Red high-temperature versions withstanding up to 650°F (343°C), making them suitable for applications like exhaust manifolds, headers, and turbochargers. The standard
black version, however, is rated for a lower range of -59°C to 232°C (continuous) and 260°C (intermittent).
With good placement, both will probably work fine but if you're paranoid...